Answer: 84/21 A= 4 square units
Explanation:
Well-sorted sediments have grains of similar size, and are the result of much sediment transport and earth processes which segregated the sediment by depositing different size fractions in different places.
The morphological trait that shows the most variation among organisms exhibiting protostome development is the type of body cavity.
<h3>What are protostomes?</h3>
Protostomes are animals having bilateral symmetry in which the mouth is developed before the anus.
The organisms (protostomes) represent the main classification feature of animals according to the type of embryo development.
The genetic analysis of molecular sequences has shown that protostomes emerged first in the evolution in the animal kingdom.
Protostomes include diverse groups of animals such as annelids, nematodes, arthropods, mollusks, flatworms, etc.
In conclusion, the morphological trait that shows the most variation among protostomes is the type of body cavity.
Learn more about protostome animals here:
brainly.com/question/347120
#SPJ1
The statement which best explains why adequate wastewater treatment is necessary for urban areas is; "Wastewater cannot be purified by nature.".
Urban areas refer to those areas that have a dense population of people and also have quite a number of industries that generate several tons of waste. Disposal of these wastes is often an important environmental concern.
Many of the wastewater produced in urban areas contain chemical substances such as cleaning agents, persistent organic pollutants, heavy metals etc. Nature can not remove these waste materials. They can only be removed by appropriate wastewater treatment.
Learn more: brainly.com/question/23979357
Proteins ! they're built from amino acid unlike carbohydrates which are made from monosaccrides